I agree completely!
It's a very odd decision to make them stack even when you die. It's one of things I can imagine will get changed as people will moan about it and abuse the hell out of it as you will be able to get your top pointstreak every time, you could have 4 or god knows how many stealth bombers lined up and just spam the map with them from all directions!
those killstreaks are crap, they arent as effective as the proper killstreaks, its a support package for noobs who basically dont get many kills.
Assault Strike Package
(kills by Killstreaks count towards next Killstreak)
3 UAV
4 Care Package ---------- GOOD
5 I.M.S (Intelligent Munitions System)
5 Predator Missile ---------- GOOD
6 Sentry Gun ---------------- GOOD
7 Precision Airstrike ---------- GOOD
7 Attack Helicopter ---------- GOOD
9 Strafe Run
9 Little Big Guard ----------- Don't Know
9 Reaper --------------- Don't Know
10 Assault Drone
12 AC130 ----------- AMAZING
12 Pave Low ---------- VERY GOOD
15 Juggernaut ----------- Don't Know
17 Osprey Gunner --------- AMAZING
Support Strike Package
(points do not reset when you die)
4 UAV
5 Counter UAV
5 Ballistic Vests
5 Airdrop Trap
8 SAM Turret ------- GOOD
10 Recon Drone
12 Advanced UAV
12 Remote Turret
14 Stealth Bomber ----- GOOD
18 EMP
18 Juggernaut Recon ------ Don't Know
18 Escort Airdrop ----- Don't Know
in that whole package the only decent ones are:
UAV's (crap anyway)
Sam Turret (cant kill anyone with it)
Stealth Bomber (the only useful one for getting kills)
Dont really know what the last 2 do, but they sound crap, EMP is just like counter UAV with a blurry screen, its just annoying.